Modeling and control of a stand alone cascaded doubly fed induction generator supplying an isolated load

The modeling and control of a variable speed cascaded doubly fed induction generator feeding an isolated grid in aircraft application is presented. Despite the complexity of the generator an efficient controller can be elaborated based on the theory of a unified reference frame vector representation. An indirect decoupled vector control of terminal voltage is implemented using field orientation techniques. The controller insures good tracking of voltage magnitude and frequency regardless load and speed variations.